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Absolute line intensities for oxirane in the 11.4 micron spectral region.



Walter J. Lafferty, Jean-Marie Flaud, Fridolin Kwabia


Absolute individual line intensities of numerous transitions of the fundamental ν15, ν12 and ν5 bands of oxirane (ethylene oxide, cyc-C2H4O) have been measured in the 790-940 cm-1 region using seven high-resolution Fourier transform spectra recorded at 0.002 cm-1 resolution and various pressures. These line intensities were least-squares fit using a theoretical model which takes into account the vibration-rotation interactions linking the upper state rotational levels, and, therefore, accurate rotational expansion of the transition moments of the ν15, ν12 and ν5 vibrational bands were derived. Using the coefficients obtained in the fitting, a line list has been generated and used to perform comparisons with the present measurements. In addition, comparisons with measurements taken at medium-low resolution of ν15/ ν12 / ν5 system show excellent agreement.
Molecular Physics


sbsolute intensities, ethylene oxide, infrared, oxirane, transition dipole momenta


Lafferty, W. , Flaud, J. and Kwabia, F. (2014), Absolute line intensities for oxirane in the 11.4 micron spectral region., Molecular Physics, [online], (Accessed April 17, 2024)
Created December 15, 2014, Updated November 10, 2018